Hoisting apparatus



Feb. 27, 1923. 1,447,025

N D. LEVIN HOISTING APPARATUS Original Filed Aug. 1, 1915 JQWTNESsES: 9,494? 7 By I.

[N VENTOR A TTORNE'Y Patented Feb. 27, 1923.

UNITED STATES PATENT OFFICE.

NTLS D. LEVIN, OF COLUMBUS, OHIO, ASSIGNO-R TO THE JEFFREY MANUFACTURING COMPANY, OF COLUMBUS, OHIO, CORPORATION OF OHIO.

HOISTING APPARATUS.

Original application flied August 1, 1913, Serial No. 782,522. Divided and this application filed April 10,

To all whom z't may concern:

Be it known that I, NILs D. LEVIN, a citizen of the United States, residing at C- lumbus, in the county ofFranklin and State of Ohio, have invented certain new and useful Improvements in Hoisting Apparatus, of which the following is a specification, reference being had therein to the accompanying drawing.

The present invention relates to certain new and useful Improvements in hoisting apparatus, and particularly to that class of apparatus adapted to wind a hoisting rope which is subject to excessive strain or sudden shock.

The especial object of this invention is to provide an apparatus of the class described with conveniently actuated means for controlling the winding and unwinding of the rope.

A further object is to provide means to lock the winding drum against rotation in the unwinding direction associated with means to relieve the rope from destructive I shock due to the sudden application of loads or to suddenly checking its unwinding while under heavy strain.

These and other objects are attained by the devices set forth in the following specification reference being had to the accompanying drawings of which Fig. 1 is a side elevation of the preferred embodiment of my invention.

Fig. 2'is a longitudinal sectional view ta- 7 ken along the central vertical plane of the device illustrated in Fig. 1.

Fig. 3 is a cross sectional View taken along the line III-III of Fig. 1.

Fig. i is a cross sectional view taken along the line IV-IV of Fig. 1.

Like numerals refer to similar parts in the several figures.

In my co-pending application Serial No. 782,522, filed August 1st, 1913, of which this application is a division, is disclosed a coal mining and loading machine comprising pick devices adapted to be vertically adjusted to engage the face of the vein at various elevations to dislodge fragments of coal thereof. As described in the above application the vertical adjustment of said pick mechanism is effected by the winding and unwinding of a suitable rope connected with the herein described hoisting apparatus.

1919. Serial No. 288,968.

Extending longitudinally of the machine, and supported in suitable journal bearings of the main frame, is the power shaft 1 which is connected through suitable gearing with the motor from which the various elements of the machine are actuated. Keyed to the shaft 1 is a hub 2 which forms the driving member of a friction clutch of the well known multiple disk type. Journaled upon the shaft 1 adjacent the hub 2 is the driven member 3 of the said friction clutch, and upon this hub is formed the drum 4: upon which is windable the rope 5. Extend ing across the machine, and journaled in suitable apertures of the side parts of the main frame, is a shaft 6. To the ends of the shaft 6 are secured upwardly extending levers 7 conveniently arranged for the rotation of said shaft. Mounted on the shaft 6 is an eccentric 8 which engages an eccentric rod 9. The rod 9 is connected at its other end to a lever 10 which is pivotally mounted at 11 on the bracket 12 secured to a convenient part of the frame 13 of the machine. The lever 10 is forked at its lower end to engage a ball bearing 14 positioned on the shaft 1 between the lever 10 and the driven member 3. Friction clutch disks 15 are interposed between the driving and driven members 3 and 2, and by the manipulation of the levers 7 the operator can, by means of the mechanism which has been described, move the member 3 longitudinally of the shaft 1, thus forcing the clutch disks firmly into contact with each other and causing the drum & to be rotated.

Embracing the outer surface of the driven member 3 is a friction band 16, which is clearly shown in Fig. 4. The tension of the band 16 can be adjusted by the bolts 17. On the outer surface of the band 16 are formed ratchet teeth 18 adapted to be engaged by the pawl 19. The pawl 19 is mounted on the pivot pin 20 which is supported in lugs of the casting 21 secured to the machine frame 13. A spring 22 tends to hold the pawl 19 in operative position and a rod 23 is provided, which extends entirely across the machine and can be grasped at either end by the operator, by means of which said pawl may be released.

When it is desired to wind the rope 5 the 'operatorgrasps one of the levers 7 and moves it forwardly, thus clutching the drum under the normal strains of service. When it is desired to allow the rope to unwind,

the lever 7 will be manipulated to cause asufficient pressure upon the clutch disks to relieve the stress upon the pawl 19 after which said pawl may be lifted by movement of the rod 23. The clutch is then partially released vand the rope allowed to unwind under the stress of its load. When a sufiicient amount of rope has been unwound the pawl 19 may be dropped into engagement w th the ratchet teeth 18 to prevent further rotatlon of the drum in the unwinding direction. If the ratchet teeth 18 were formed directly upon the clutch member 3, or if the friction band 16 were immovably attached thereto, the abrupt engagement of the pawl 19 would subject the rope 5 and its associated parts to a violent shock which mightbe sufiicient to break the rope or other parts of the apparatus. By the slippage of the band 16however a sufiiciently yielding abutment is provided to arrest the load upon. the rope without injurious shock to the associated devices. Should the associated devices be subjected to an accidental contact with an immovable abutment or, for an other cause an excessive stress be applied to the rope 5, the slippage of the friction band 16 would permit the yielding of the rope without subjecting the hoisting devices to serious strains.

What I claim is 1. In a hoisting apparatus, the combination with a power'shaft, of a winding drum mounted upon said power shaft for free rotation thereon, controllable means to connect said power shaft with said drum to drive it, a rope windable on said drum, a brake drum rigidly connected with said winding drum, a brake band encircling the brake drum, ratchet teeth upon the brake band, and a pawl adapted to engage the ratchet teeth to prevent the'revolu'tion of the brake band and thereby resist the unwinding of the rope.

2. In a hoisting apparatus, the combination with a power shaft, of a winding drum mounted upon said shaft for free rotation thereon, a rope windable on said drum, a clutch within the control of the operator to connect said power shaft with said .drum to drive it, a brake drum rigidly connected to said winding drum, a brake band encircling the brake drum, meanstoprevent the rotation of the brake band in the rope unwinding direction, and means within the control of the operator to hold said preventing means inoperative.

3. In a hoisting apparatus, the combination with a power shaft, of a winding drum mounted upon said shaft for free rotation thereon, a rope windable upon said drum, a clutch within the control of the operator to connect said shaft with said drum to drive it, a member frictionally connected with said drum, means to prevent the rotation of said member in a rope unwinding direction, and means within the control of the operator to hold said preventing means inoperative.

4. In a hoisting apparatus, the combination with a power shaft, of a winding drum mounted upon said power shaft for free rotation thereon, a re e windable upon said drum, a clutch withln the control of the operator to connect said shaft to said drum to drive it, a brake drum rigidly connected with said winding drum, a brake band encircling the brake drum, automatically acting means to prevent the rotation of said brake band in a rope unwinding direction, and means within the control of the operator to hold said preventing means inoperative.

In testimony whereof, I afiix my signature.

NILS 1D. LJEVlIN. 

